check string is alphanumeric or not python code example

Example 1: check if string is number or not php

$var_num = "1";
$var_str = "Hello World";

var_dump( is_numeric($var_num), is_numeric($var_str) );

/* 
Output -
 bool(true)
 bool(false)
*/

Example 2: check if string in string c

if(strstr(sent, word) != NULL) {
    /* ... */
}

Example 3: in javascript check is is an array or not

Array.isArray(yourItem)